JPH06168388A - Fire sensor - Google Patents

Abstract

PURPOSE:To take out the values of first and second calibration data correspond ing to first and second gas used for adjusting the sensitivity of a sensor by providing a light emitting lamp, respectively specific memories and a signal output circuit. CONSTITUTION:Output data y1 are the output data to a D/A conversion circuit 71 required for displaying a smoke density (approximately 0.005%/m) corresponding to oxygen gas on the smoke density display device 2d of a receiver 2, are calculated beforehand and are stored in a ROM 60. Also, the output data y2 are stored the smoke density (approximately 0.035%/m) corresponding to chlorofluorocarbons(CFCs) similarly in the ROM 60. That is, since an oxygen gas density is 0.005%/m, in the case of injecting the oxygen gas to a smoke room 30, only the part of 'OK' is lighted in the device 2d. Also, since the density of CFCs 12 is 0.035%/m, in the case of injecting the CFC gas to the smoke room 30, the parts of 'OK,' '0.01,' '0.02' and '0.03' are lighted in the device 2d.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-sensitivity smoke-type fire detection device which takes in a plurality of sample gases into a smoke chamber and calibrates the sensitivity characteristics.

[0002]

2. Description of the Related Art In the case where a plurality of sample gases are taken into a smoke chamber to calibrate the sensitivity characteristic of a smoke sensor, conventionally, oxygen gas,
Two kinds of pure gases with greatly different molecular weights, such as Freon 12 gas (CCl ₂ F ₂ ), are alternately passed through the smoke chamber, and the light generated by the light-emitting lamp is scattered by the molecules of the sample gas. The sensitivity characteristic of the smoke sensor is calibrated by utilizing the fact that the light receiving element captures.

In other words, pure gas is stable in concentration, and when attention is paid to a certain pure gas, when this pure gas is taken into the smoke chamber and the pure gas is detected as smoke, a certain smoke concentration value is output. Moreover, the smoke density value output is very small. In other words, there is a correspondence between certain pure gas and smoke concentration, and the smoke concentration is very small,
This can be used to calibrate the sensitivity characteristics of a highly sensitive smoke sensor.

In a conventional fire detection device such as a smoke detector, a xenon lamp emits light, and after the light generated by the xenon lamp is scattered, the scattered light is received by a light receiving element, and the peak of the output signal of the light receiving element. The subtraction circuit subtracts a predetermined value from the value and sends the data to the receiver via the signal transmission circuit. The gain adjustment variable resistor adjusts the gain of the amplifier, and the offset amount adjustment variable resistor in the subtraction circuit adjusts the predetermined value to be subtracted from the peak value. That is, in order to adjust the sensitivity characteristic of the smoke sensor, by adjusting the variable resistor for gain adjustment, the slope of the sensitivity characteristic is adjusted, and by adjusting the variable resistor for offset amount adjustment, the sensitivity characteristic is adjusted. Translate.

[0005]

However, in practice, the smoke chamber is filled with the first gas, and the sensitivity characteristic is moved in parallel so as to obtain a predetermined output corresponding to the first gas. Even if the slope of the sensitivity characteristic is adjusted so that the smoke chamber is filled with the smoke gas and a predetermined output corresponding to the second gas is obtained, when the first gas is filled again, a predetermined amount corresponding to the first gas is obtained. There is a deviation from the output of. Therefore, there is a problem that the sensitivity characteristics of the smoke sensor cannot be accurately calibrated unless these adjustments are repeated many times.

To solve this problem, the memory stores the output data of the A / D conversion circuit when the first gas is filled in the smoke chamber as the first calibration data, and the second data is stored in the smoke chamber. The memory stores the output data of the A / D conversion circuit when the gas is filled as the second calibration data, and outputs the first calibration data, the second calibration data, and the current output of the A / D conversion circuit. It is conceivable that a microcomputer or the like calculates an appropriate smoke density value based on the data.

In this case, at a later date, the first calibration data,
It is assumed that there is a need to know the value of the second calibration data, and in preparation for this, there is a request to be able to retrieve the values of the first calibration data and the second calibration data.

According to the present invention, when the first gas and the second gas are used to adjust the sensitivity of the fire detection device, the values of the first calibration data and the second calibration data corresponding to those gases are used. It is an object of the present invention to provide a smoke-type fire detection device capable of taking out a fire.

[0009]

According to the present invention, an A / D conversion circuit for converting an output signal of a light receiving element that receives light from a light emitting lamp into a digital signal is provided, and a smoke chamber is filled with a first gas. The output data of the A / D conversion circuit when the second chamber is stored is stored in the memory as the first calibration data, and the output data of the A / D conversion circuit when the smoke chamber is filled with the second gas is the second calibration data. A signal output circuit for storing the first calibration data and the second calibration data stored in the memory as data is provided.

[0010]

The present invention is provided with an A / D conversion circuit for converting the output signal of the light receiving element receiving the light from the light emitting lamp into a digital signal, and the A / D when the smoke chamber is filled with the first gas. The output data of the conversion circuit is stored in the memory as first calibration data, and the output data of the A / D conversion circuit when the smoke chamber is filled with the second gas is stored in the memory as second calibration data. Since the signal output circuit for transmitting the first calibration data and the second calibration data stored in this memory is provided, the values of the first calibration data and the second calibration data can be retrieved at a later date. .

[0011]

FIG. 1 is a block diagram showing an embodiment of the present invention.

In this embodiment, in the smoke detector 1 as the fire detecting device, the xenon lamp 10 and the light receiving element 20 are provided in the smoke chamber 30, and the xenon lamp 10 and the light receiving element 20 are separated by the light shielding plate 34. Has been. Then, the xenon lamp 10 emits light, and the light is scattered by the smoke in the smoke chamber 30 and reaches the light receiving element 20.

The xenon lamp 10 is supplied with a high voltage required for light emission from a high voltage generating circuit 12, and a trigger circuit 11
The light emission timing is controlled by the trigger signal supplied from. The trigger circuit 11 generates a trigger signal based on the control signal supplied from the control circuit 50.

The smoke chamber 30 is connected to a sampling pipe 31 that guides the atmosphere of the fire monitoring area to the smoke chamber 30 and a pipe 32 that guides the air in the smoke chamber 30 to the outside of the smoke sensor 1. A suction fan 33 is provided.

The amplifier 40 amplifies the output signal of the light receiving element 20, its gain is controlled by the gain switching circuit 41, and the peak hold circuit 42 is a circuit for holding the peak of the output signal of the amplifier 40. , A / D
The conversion circuit 43 is a circuit that converts the analog signal output by the peak hold circuit 42 into a digital signal.

The control circuit 50 is composed of a microcomputer or the like and controls the smoke detector 1 as a whole.
The current smoke density in the smoke chamber 30 is judged based on the digital signal from the / D conversion circuit 43.

The ROM 60 stores the program of the flowchart shown in FIG.

EEPR for detection value of reference gas for memory calibration
The OM 61 stores the output data of the A / D conversion circuit 43 when the pure oxygen gas is sucked into the smoke chamber 30 at 1 atm and room temperature as the first calibration data.
A / D when pure gas of 2 is sucked into the smoke chamber 30
It is a ROM that stores output data of the conversion circuit 43 as second calibration data.

The output correction EEPROM 62 includes the amplifier 4
When the output level of 0 drops below a predetermined value, the amplifier 4
This is a ROM that stores a value K indicating the number of corrections, although the gain of 0 is corrected in several steps.

The EEPROM 63 is a xenon lamp 10.
Is a ROM that stores the number of times of not emitting light (the number of times of no light emission) when it should emit light, and stores the number of times of no light emission for each month. The RAM 64 is a working memory.
The EEPROMs 61, 62, 63 are examples of electrically rewritable nonvolatile memories.

The D / A conversion circuit 71 is a signal transmission circuit 7
2. To send a signal to the receiver 2 via the connector C,
It is a circuit that converts a digital signal output by the control circuit 50 into an analog signal. The receiver 2 is equipped with a smoke density display device 2d (a display device having a bar graph indicator lamp shown in FIG. 4) for displaying the smoke density.

The signal output circuit 72 is a circuit for outputting a signal corresponding to the detected smoke density, and the ROM 61.
Is a circuit for transmitting the first calibration data and the second calibration data stored in the ROM 62, is a circuit for transmitting the data of the number of times the gain increase command switch stored in the ROM 62 is operated, and is stored in the ROM 63. It is a circuit for transmitting the data of the number of times of non-light emission.

The life warning signal sending circuit 73 is a circuit for sending a life warning signal for warning that the xenon lamp 10 is nearing the end of life.

The calibration confirmation lamp circuit 74 is a circuit that indicates that the sensitivity of the smoke sensor 1 is being adjusted when the sensitivity is being adjusted.

The switches SW1 and SW2 are lock-type switches that operate depending on the type of gas used when calibrating the sensitivity of the smoke sensor 1, and the switch SW3 is used when calibrating the sensitivity of the smoke sensor 1. It is a non-locking switch that turns on for 5 seconds or longer.

Next, the operation of the above embodiment will be described.

FIG. 2 is a flow chart showing the operation of the above embodiment. In this flowchart, first, initialization is performed, the correction command number K and the function An are set to "0", and the function n is set to "1" (S0). Then, a non-emission count program for counting the number of times that the xenon lamp 10 should not emit light is executed (SB), a smoke sensing operation is executed (S1 to S4), and it is determined that the switch SW3 is turned on. If the switch SW3 is turned on, it is determined how long the turn-on time is. If the switch SW3 is turned on for less than 5 seconds, the fact that the switch SW3 is turned on is stored in the RAM 64 (S1).
1), when the output level of the A / D conversion circuit 43 decreases due to a decrease in the light emission rate of the xenon lamp 10 or the like,
An output correction program for increasing the value of the digital signal supplied to the D / A conversion circuit 71 is executed (SA), and if the switch SW3 is turned on for 5 seconds or more (S11), the sensitivity of the smoke sensor 1 is adjusted. Perform the preparatory operation (S11-S
23)), in the process, EEPROMs 61, 62, 63
The data output program for outputting the various data stored in is executed (SC).

First, the sensitivity adjustment preparation operation (S11 to S2)
3) will be described.

Before performing the sensitivity adjustment of the smoke detector 1, for example, at a pressure of 1 atm and room temperature, the sampling pipe 31
While the smoke chamber 30 is filled with pure oxygen gas through the switch SW1, the switch SW1 is turned on, the switch SW2 is turned off, and the sensitivity adjustment command switch SW3 is turned on for 5 seconds or more. In this way, the sensitivity adjustment command switch SW
When 3 is turned on for 5 seconds or more (S11), the confirmation lamp of the calibration confirmation lamp circuit 74 is lit for 1 second to notify that the switch SW3 has been activated (S12). At this time, since the switch SW1 is on and the switch SW2 is off (S13, 14), the output signal of the light receiving element 20 is amplified in the state where the smoke chamber 30 is filled with pure oxygen gas, and this is amplified. The peak value of the signal is held in the peak hold circuit 42, the peak value is converted to digital data by the A / D conversion circuit 43, and the converted output data is stored in the EEPROM 61 as the first calibration data x ₁ ( S15), and smoke detection operations (S1 to S4) described below are executed.

The pure oxygen gas is discharged from the pipe 32, and the pure CFC 12 (F12) is passed through the sampling pipe 31 at 1 atmospheric pressure and room temperature, for example.
Fill the smoke chamber 30 with gas, turn off the switch SW1,
The switch SW2 is turned on, and the sensitivity adjustment command switch SW3 is turned on for 5 seconds or more. In this way, when the sensitivity adjustment command switch SW3 is turned on for 5 seconds or more (S11), the confirmation lamp of the calibration confirmation lamp circuit 74 is lit for 1 second to notify that the switch SW3 has worked (S12). ). At this time, since the switch SW1 is off and the switch SW2 is on (S13, 21), the output signal of the light receiving element 20 is amplified by the amplifier circuit 40 in a state where the smoke chamber 30 is filled with the pure CFC 12 gas. The peak value of the amplified signal is held in the peak hold circuit 42, the peak value is converted into digital data by the A / D conversion circuit 43, and the converted output data is converted into the second output data.
Is stored in the EEPROM 61 as the calibration data x ₂ of (S
22), the smoke sensing operation (S1 to S4) described later is executed.
If both switches SW1 and SW2 are on,
Of the data stored in the EEPROM 61, the data other than the calibration data is cleared (S23), and the switch S
If both W1 and SW2 are off, the data output program is executed (SC).

Next, the smoke sensing operation including the sensitivity adjusting operation (S
1 to S4) will be described.

When the sensitivity adjustment preparation operation is completed as described above, the first calibration data x ₁ , from the EEPROM 61,
The second calibration data x ₂ is read (S1), and the current detection data (current output data of the A / D conversion circuit 43) x is fetched (S2). Then, the first calibration data x ₁ , the second
Based on the calibration data x ₂ , the current detection data x, the output data y ₁ corresponding to the data x ₁ to the D / A conversion circuit 71, and the output data y ₂ corresponding to the data x _2.
The output data to the D / A conversion circuit 71 necessary for displaying the appropriate smoke density value corresponding to
The controller 50 and the ROM 60 perform calculation, that is, sensitivity adjustment (S3).

The output data y ₁ is necessary for displaying the smoke density (about 0.005% / m) corresponding to the oxygen gas (first gas) on the smoke density display device 2d of the receiver 2. Na D
Output data to the A / A conversion circuit 71, which is calculated in advance and stored in the ROM 60. The output data y ₂ is the smoke concentration (about 0..0) corresponding to Freon 12 gas (second gas).
(035% / m) is output data to the D / A conversion circuit 71 necessary to display the smoke density display device 2d, and is calculated in advance and stored in the ROM 60. That is, since the concentration of oxygen gas is about 0.005% / m, when oxygen gas is injected into the smoke chamber 30, “OK” is displayed on the smoke concentration display device 2d as shown in FIG. 4 (1). Only the part of is turned on, the concentration of Freon 12 gas is about 0.035% / m
Therefore, when the Freon gas is injected into the smoke chamber 30, as shown in FIG. 4B, "OK", "0.01", "0.02", "0" are displayed on the smoke concentration display device 2d. .0
The part "3" is turned on.

That is, the output data y to the D / A conversion circuit 71 necessary for displaying the proper smoke density value corresponding to the current output data x on the smoke density display device 2d is sent to the controller 50 and the ROM 60. In the case of calculation, the characteristic to be obtained from this is generally expressed by the formula y = ax as shown in FIG.
It is represented by + b, and this general formula “y = ax + b” is expressed by the formula “y ＝ {(y ₂ −
y ₁ ) / (x ₂ -x ₁ )} · x + (y ₁ · x ₂ -y ₂ · x ₁ ) / (x ₂ -x ₁ ) ”will be described below.

From FIG. 3, y ₁ = ax ₁ + b and y ₂ = ax ₂ + b. Solving simultaneous equations based on these two equations, a = {(y ₂ −y ₁ ) / ( x ₂ -x ₁ )}, b = (y ₁ x ₂ -y ₂ x ₁ ) / (x ₂ -x ₁ ). Therefore, substituting a and b into the general formula, y = ax + b = {(y ₂ −y ₁ ) / (x ₂ -x ₁ )} ・ x ＋ (y ₁・ x ₂ -y ₂・ x ₁ ) / (x _2-
x ₁ ). The output data y thus obtained is D /
When supplied to the A conversion circuit 71, the D / A conversion circuit 71 converts the output data y into an analog signal, and the signal output circuit 72 sends it to the receiver 2 to obtain the current output data x of the A / D conversion circuit 43. The corresponding appropriate smoke density value is the smoke density display device 2
It is displayed in d. For example, the current smoke density is 0.06%
/ M, as shown in FIG. 4 (3), "O
The parts "K" and "0.01" to "0.06" are turned on.

FIG. 5 is a flow chart showing the no-light-emission count program (SA) in the above embodiment.

First, in this embodiment, the xenon lamp 1 is used.
Since the number of times that 0 does not emit light, that is, the number of times of no light emission, is stored for each month, 0 is set as an initial value immediately after the smoke sensor 1 is installed or immediately after the xenon lamp 10 is replaced. The function n indicating whether it is the month is set to "1", and the function An indicating the number of no light emission in the nth month is set to "0" (S0). After that, every time one month elapses (S31), the function n is incremented by 1, and the function An of the number of no light emission in the new month is set to "0" (S32).

Then, when a light emission command is issued from the control circuit 50 (S33), if the level of light received by the light receiving element 20 does not reach the predetermined level (S34), the number of non-light emission is increased by 1 (step S34). S35). That is, the function An of the number of non-emissions in the month is increased by 1, and this number is increased to E
It is stored in the corresponding portion of the EPROM 63.

Then, the control circuit 50 compares the value of the function An of the number of times of no light emission in the month (total number of times of no light emission in the month) with the alarm level A _max (7 times in the above embodiment) (S36). ), If the total number of no light emission in that month is 7 times or more, a life warning signal is output (S
37). This life warning signal is sent to the receiver 2 via the sending circuit 73 and the connector C.

The above operation (S31 to S37) is executed every time a light emission command is issued, and then the process returns.

FIG. 6 shows the EEPRO in the above embodiment.
It shows an example of storing the number of times of no light emission stored in M63. In this example, from the installation of the smoke sensor 1 to the first to sixth months, no non-light emission occurs once, and at the seventh and eighth months, respectively, once, respectively, once, respectively, 9, 10, 11, 12, 1
It has occurred 3, 2, 3, 5, 10 times each in the 3rd month. By looking at these stored contents, it is possible to determine whether or not it is time to replace the xenon lamp 10 installed in the smoke detector. In other words, when the xenon lamp 10 breaks down, the number of times of non-light emission usually increases gradually, and after the number of times increases to some extent, the xenon lamp 10 breaks down. It can be determined whether it is time to replace.

Even if the stored contents are not checked, if the total number of non-light emission in the month is equal to or more than the predetermined number, a life warning signal is output, and the receiver 2 sounds an alarm based on the signal. Therefore, the failure occurrence of the xenon lamp 10 can be easily predicted. When warning the life, a sound such as a bell or a voice may be used, and a visual means such as a lamp or a display display means may be used.

FIG. 7 shows the EEPRO in the above embodiment.
It is a figure which shows the relationship between the frequency | count of no light emission memorize | stored in M63, and an alarm level. Although in this embodiment is set to 7 times as an alarm level A _{ma x,} it may be set other times.

FIG. 8 is a circuit diagram showing a specific example of the gain switching circuit 41 used in the above embodiment.

The gain switching circuit 41 has a resistor Rs provided between the light receiving element 20 and the amplifier 40, resistors Rf1, Rf2, Rf3 and Rf4 connected in series, and a rotary switch CS. Resistors Rf1, Rf2, R
The series circuit composed of f3 and Rf4 is connected between the input terminal and the output terminal of the amplifier 40, and the rotary switch CS has a connection point P1 between the resistors Rf1 and Rf2 and a resistor Rf.
The connection point P2 between 2 and Rf3, the connection point P3 between the resistors Rf3 and Rf4, and the vacant point P4 are switched and connected between the input terminal and the output terminal of the amplifier 40. In practice, the rotary switch CS Is composed of electronic switches. Note that the gain of the amplifier 40 is determined by the series connection resistors Rf1 and Rf.
The ratio of the combined value of 2, Rf3 and Rf4 (this value changes depending on the switching of the rotary switch CS) and the value of the resistance Rs is almost the same. That is, the resistors Rf2, Rf3, R
The value of f4 is set to 20% of the value of the resistor Rf1,
Connect the rotary switch CS to the connection points P1, P2, P3, P4.
When sequentially switched to, the gain of the amplifier 40 changes to 1 times, 1.2 times, 1.4 times, and 1.6 times respectively when the rotary switch CS is connected to the connection point P1.

Next, the operation of the above embodiment will be described.

FIG. 9 is a flowchart showing the output correction program (SA) in the above embodiment.

First, the function K indicating the number of correction commands is "0".
Is set to (S0). When the light emitting efficiency of the xenon lamp 10 is lowered, the light receiving efficiency of the light receiving element 20 is lowered, or when the xenon lamp 10 and the light receiving element 20 are contaminated, the level of the output signal of the light receiving element 20 is gradually lowered. At this time, in the embodiment, correction is performed to increase the gain (amplification factor) of the amplifier 40, and the correction command count K indicates the correction count.

Then, the control circuit 50 compares the current output level of the A / D conversion circuit 43 with a predetermined value (comparison reference level) (S52), and the A / D conversion circuit 4
If the current output level of 3 is greater than or equal to a predetermined value, A /
Since there is no problem with the current output level of the D conversion circuit 43, the process returns.

However, if the current output level of the A / D conversion circuit 43 is lower than a predetermined value, the smoke density cannot be detected normally, that is, smoke having a density corresponding to the fire level enters the smoke chamber 30. However, since an unreported state occurs, which determines that it is not a fire, an abnormality is displayed by an abnormal state display device (not shown) (S53). If the person watching this abnormality display has turned on the switch SW3 for, for example, 1 second or more and less than 5 seconds (S54), that is, if a command to increase the gain of the amplifier 40 is issued, the correction command number K is "1". When the correction command number K is incremented (S55) and the correction command number K is "4" or more at this time (S56), the correction command number K is reset to "0" (S57). If "0" (S58), EEP
"0" is stored in the ROM 62 as the correction command number K (S59). The on time of the switch SW3 is S11.
If it is determined in step S1, and that it is ON for correction (ON for less than 5 seconds), that fact is stored as a flag in the RAM 64, for example, and the flag is cleared when the correction command number K is incremented. .

If the correction command number K is "0", the contact point of the rotary switch CS shown in FIG. 8 is connected to the point P1, and the amplifier 40 and the peak hold circuit 42 are connected.
The resistance of the feedback loop is only the resistance Rf1, and the amplifier 40 operates with a gain according to the ratio of the value of the resistance Rs to the value of the resistance Rf1 (operating with a normal gain). That is, if the gain of the amplifier 40 is 1 times the normal value, that is, if the amplification factor of the amplifier 40 is 1000, then 100
It is set to 0.

On the other hand, the correction command number K has been "0" until now, and an abnormal display is made due to a decrease in the luminous efficiency of the xenon lamp 10 (S53). At this time, the switch SW3 is turned on for less than 5 seconds. (S54), correction command count K
Changes to "1" (S55), and the gain of the amplifier 40 needs to be corrected for the first time. In this case, EEPROM6
“1” is stored as the correction command number K in 2 (S6
1), the gain of the amplifier 40 is corrected to 1.2 times (S
62, S63), the abnormality display is cleared. At this time, the contact of the rotary switch CS shown in FIG. 2 is switched to the point P2, and the resistance of the feedback loop between the amplifier 40 and the peak hold circuit 42 becomes the resistance Rf1 + R.
The gain becomes f2, and the amplifier 40 operates with a gain corresponding to the ratio of the combined value of the resistors Rf1 + Rf2 and the value of the resistor Rs. That is, if the gain of the amplifier 40 is 1.2 times the normal value, that is, if the initial amplification factor is 1000, the gain will be increased to 1200.

When the gain of the amplifier 40 is increased in this way, when the output signal level of the light receiving element 20 is lowered due to a reduction in the luminous efficiency of the xenon lamp 10 or the like, the smoke sensor 1 is not replaced with a substitute. The smoke sensor 1 can perform normal operation as it is. Therefore, the smoke sensing operation can be continued, and the maintenance is efficient.

After that, when the output level of the light receiving element 20 further decreases, the abnormal display is again displayed and the switch SW3
When is pressed (S53, S54), the correction command count K is "2".
(S55), the gain of the amplifier 40 is corrected again, and "2" is stored as the correction command number K in the EEPROM 62 (S61). Since K = 2, the gain of the amplifier 40 is 1. It is corrected to 4 times (S62, S
64, S65), the abnormality display is cleared. That is, the contact point of the rotary switch CS shown in FIG.
The resistance of the feedback loop switched between the amplifier 40 and the peak hold circuit 42 is switched to the resistance Rf1 + Rf2 +.
It becomes Rf3, the amplifier 40 operates with a gain according to the ratio of the combined value of the resistors Rf1 + Rf2 + Rf3 and the value of the resistor Rs, and the gain of the amplifier 40 increases to 1.4 times the normal value.

Then, when the output level of the light receiving element 20 drops again, an abnormal display is made, and when the switch SW3 is pressed (S53, S54), the correction command number K changes to "3" (S55), and the EEPROM 62 is stored. Since “3” is stored as the correction command number K (S61) and K = 3, the gain of the amplifier 40 is corrected to 1.6 times (S62, S).
64, S66), the abnormality display is cleared. That is, the contact point of the rotary switch CS shown in FIG.
The resistance of the feedback loop switched between the amplifier 40 and the peak hold circuit 42 is switched to the resistance Rf1 + Rf2 +.
Rf3 + Rf4, and resistance Rf1 + Rf2 + Rf3 +
The amplifier 40 operates with a gain corresponding to the ratio of the combined value of Rf4 and the value of the resistor Rs, and the gain of the amplifier 40 is 1.
6 times increase. The correction operation (S63, S65, S6
After performing 6), return.

FIG. 10 is a flow chart showing the data output program (SC) in the above embodiment.
FIG. 1 is a diagram showing a display example of a smoke density display device (composed of a bar graph indicator lamp) 2d during data output.

In this case, as shown in FIG. 1, the smoke detector 1
Is connected to the receiver 2 via a connector C, and the receiver 2 is provided with a smoke concentration display device having a bar graph indicator lamp shown in FIG. 4, and therefore ROM, 61, 62, 63.
The contents of the various data stored in are displayed on the smoke concentration display device 2d having a bar graph indicator lamp.

First, the first calibration data x ₁ is read from the ROM 61, and the first calibration data x ₁ is output to the smoke density display device 2d having a bar graph indicator for 1 second (S).
71). At this time, the first calibration data x ₁ is the smoke concentration when pure oxygen gas is supplied to the smoke chamber 30, and this concentration is 0.005% / m, which has a bar graph indicator lamp. When displayed on the smoke density display device 2d, 0.01%
Since it is less than / m, as shown in FIG. 4 (1), "OK"
Is displayed for 1 second only. Then, a zero value is output for 1 second (S72), and the display of the bar graph indicator lamp of the smoke density display device 2d is turned off. The reason why all the displays are extinguished for 1 second in this way is to visually clarify the boundary between one display and the next display.

Next, the second calibration data x ₂ is read from the ROM 61, and the second calibration data x ₂ is output to the smoke density display device 2d for 1 second (S73). At this time, the second
Calibration data x ₂ is the smoke concentration when pure CFC 12 gas is supplied to the smoke chamber 30, and this concentration is 0.035% /
m, and when this is displayed on the smoke density display device 2d, as shown in FIG.
Only the display of "0.03" is lit for 1 second. Then, a zero value is output for 1 second (S74), and the display of the bar graph indicator of the smoke density display device 2d is turned off.

Then, the value of the number of times of gain correction K stored in the ROM 62 is read (S81), and the value of K is multiplied by a predetermined value, for example 0.01 times, and output (S82). By doing so, for example, if the number of gain corrections is 2, K = 2, and multiplying this by 0.01 results in 0.02.
As shown by the dotted line in FIG. 11, the smoke density display device 2
The bar graph indicator of d is "OK", "0.01",
"0.02" is lit to inform that the number of corrections is two. If you have not corrected the gain,
Since K = 0, nothing may be turned on in the smoke concentration display device 2d having a bar graph indicator light, or "OK" may be turned on as shown by a solid line in FIG. . Then, a zero value is output for 1 second (S8
3).

Next, the number of times of no light emission is displayed for each month. Prior to this, the variable n indicating the number of elapsed months is set to "1" (S91), and the number of times of no light emission of the nth month is read from the ROM 63. Is output to the smoke density display device 2d having a bar graph indicator for 1 second (S92), and the above operation is repeated until the last month (S94, S95). Here, since the number of times of non-light emission is "0" for 1 to 6 months, only the display of "OK" is lit on the bar graph indicator of the smoke concentration display device 2d.
Since the number of times of non-light emission is "1" for 7 and 8 months, "OK" is displayed on the bar graph indicator of the smoke density display device 2d.
Since the display of "0.01" is turned on and the number of non-emissions is "3" for 9 months, the bar graph indicator of the smoke concentration display device 2d displays "OK", "0.01" to "0". The display of ".03" is turned on. In this way, the smoke density display device 2
The number of times of non-light emission can be easily recognized by looking at the lighting display of the bar graph indicator lamp of d, and by counting the number of times of lighting, it can be easily recognized what month the number of non-light emission is large.

In the above embodiment, the ROMs 61 and 6 are used.
Although the contents of various data stored in Nos. 2 and 63 are displayed on the bar graph indicator of the smoke concentration display device 2d, instead of being displayed on the bar graph indicator of the smoke concentration display device 2d, a pen recorder is used. A personal computer or the like may be connected to the smoke detector 1 via the connector C, and the contents of various data may be displayed on the pen recorder, the personal computer, or the like.

In the above embodiment, the smoke detector 1 transmits the analog signal to the receiver 2, but it may transmit the analog signal to the receiver 2.

Further, in the above embodiment, the data is output to the receiver 2 by operating the switches SW1, SW2, SW3 provided in the smoke detector 1, but the receiver SW2, SW2, SW3 is operated. SW2 and SW3 are provided, data output to the receiver 2 is started by operating a switch on the receiver 2 side, and the smoke concentration display device 2d of the receiver 2 is started.
You may make it call data.

Further, in the above-described embodiment, the smoke sensor 1 side is provided with the EEPROM 61, 62, 63 for detecting the calibration reference gas, for correcting the output value, and for storing the number of times of non-light emission. , 62, 63 to receiver 2
Alternatively, it may be provided on the repeater side (not shown).

[0066]

According to the present invention, necessary data can be taken out in a fire detecting device in which a light receiving element receives light from a light emitting lamp and a smoke density is detected according to data output by the light receiving element. Has the effect.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the above embodiment.

FIG. 3 is a diagram showing a relationship between output data of an A / D conversion circuit 43 and output data of a D / A conversion circuit 71 in the above embodiment.

FIG. 4 is a diagram showing a smoke density display device 2d provided in a receiver connected to the embodiment.

FIG. 5 is a flow chart showing a non-emission count program (SB) in the above embodiment.

FIG. 6 is a diagram showing a storage example of a non-light emission count stored in an EEPROM 63 in the above embodiment.

FIG. 7 is a diagram showing a relationship between the number of times of no light emission and an alarm level stored in an EEPROM 63 in the above embodiment.

FIG. 8 is a circuit diagram showing a specific example of a gain switching circuit used in the above embodiment.

FIG. 9 is an output correction program (S
It is a flow chart which shows A).

FIG. 10 is a flowchart showing a data output program (SC) in the above embodiment.

FIG. 11 is a diagram showing a display example of a bar graph indicator lamp of the smoke density display device 2d during data output.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Smoke detector, 2 ... Receiver, 2d ... Smoke density display device, 10 ... Xenon lamp, 11 ... Trigger circuit, 20 ... Photosensitive element, 30 ... Smoke chamber, 40 ... Amplification circuit, 41 ... Gain switching circuit, 50 ... control circuit, 60 ... ROM, 61 ... EEPROM for detection value of calibration reference gas, 62 ... EEPROM for output value correction, 63 ... EEPROM for storing number of times of no light emission, 74 ... Calibration confirmation lamp circuit.

Claims (3)

[Claims] 1. A smoke chamber having a light emitting lamp and a light receiving element for receiving light from the light emitting lamp; an A / D conversion circuit for converting an output signal of the light receiving element into a digital signal;
The output data of the A / D conversion circuit when the smoke chamber is filled with the first gas is stored as first calibration data, and the output data when the smoke chamber is filled with the second gas is stored. A memory for storing output data of the A / D conversion circuit as second calibration data; and a signal output circuit for transmitting the first calibration data and the second calibration data stored in the memory. Fire detection device characterized by the above. 2. A fire detection device comprising a light-emitting lamp and a light-receiving element for receiving light from the light-emitting lamp, and detecting smoke density according to an output signal of the light-receiving element, wherein the light-emitting lamp emits light. No-light-emission detecting means for detecting non-light-emission of the light-emitting lamp corresponding to the light-emission command by monitoring the instruction and the light-emission of the light-emission lamp; A signal output circuit for sending the data of the number of times of non-light emission stored in the memory; 3. A light emitting lamp, a light receiving element for receiving light from the light emitting lamp, and an amplifier for amplifying an output signal of the light receiving element, and the smoke density is detected according to the output signal of the amplifier. In the fire detection device, level comparing means for comparing the value of the output signal of the amplifier with a predetermined value; when the value of the output signal of the amplifier is less than or equal to the predetermined value, the value of the output signal of the amplifier is abnormal. Abnormality display means indicating that there is; a gain increase command switch that issues a command to increase the gain of the amplifier; gain increase means that increases the gain of the amplifier according to a command from the gain increase command switch; A memory for storing the number of times the increase command switch has been operated; and data for storing the number of times the gain increase command switch has been operated, which is stored in this memory. Fire sensing device characterized by having a; and a signal output circuit.